CGI

Common Gateway Interface

CHKPT

CHecKPoinT

CI

Control Interval

CICS

Customer Information Control

 

System

CICS/DOS/VS

Customer Information Control

 

System/Disk Operating

 

System/Virtual Storage

CICS/VS

Customer Information Control

 

System/Virtual Storage

CLIST

Command LIST

CMIP

Common Management

 

Information Protocol

CMOS

Complementary Metal Oxide

 

Semiconductor

CMS

Conversational Monitor

 

System

COBOL

COmmon Business Oriented

 

Language

CP

Control Program

CPU

Central Processing Unit

CRLF

Carriage Return/Line Feed

CSA

Common System Area

CSAR

Complex System Availability

 

and Recovery

CSD

CICS System Definition

CSECT

Control SECTion

CSF

Crypto Support Facility

CSL

Callable Services Library

CSM

Communication Storage

 

Manager

CSP

Cross System Product

CSSF

Customer Software Support

 

Facility

CTC

Channel To Channel

CTCA

Channel To Channel Adapter

CVOL

Control Volume

DA

Direct Access

DADSM

Direct Access Device Space

 

Management

DAM

Direct Access Method

DASD

Direct Access Storage Device

DB

Data Base

DB/DC

Data Base/Data

 

Communications

DB2

Data Base 2

DBA

Data Base Administrator

DBCS

Double Byte Character Set

DBD

Data Base Directory

DBRC

Data Base Recovery Control

DBSU

Data Base Services Utility

DC

Data Communication

DCB

Data Control Block

DCE

Distributed Computing

 

Environment

DCF

Document Composition

 

Facility

DCT

Destination Control Table

DD

Data Definition, Data

 

Dictionary

DDL

Data Definition Language

DDNAME

Data Definition NAME

DEB

Data Extent Block

DECB

Data Event Control Block

DEQ

DEQueue

DES

Data Encryption Standard

DFDSS

Data Facility Data Set

 

Services

DFHSM

Data Facility Hierarchical

 

Storage Manager

DFP

Data Facility Product

DFS

Distributed File System

DFSMS

Data Facility Storage

 

Management Subsystem

DISOSS

DIStributed Office Support

 

System

DITS

Data Information Transfer Set

DITTO

Data Interfile Transfer,

 

Testing & Operations utility

DL/I

Data Language 1

DLBL

Disk LaBeL

DLIB

Distribution LIBrary

DML

Data Manipulation Language

DOS

Disk Operating System

DOS/VS

Disk Operating System/Virtual

 

Storage

DP

Data Processing

DQM

Distributed Queue

 

Management

DRDA

Distributed Relational

 

Database Architecture

DS

Define Storage

DSA

Dynamic Storage Area

584VSE to OS/390 Migration Workbook

Page 607 Page 609
Page 608
Image 608
IBM OS/390 Common Gateway Interface, CHecKPoinT, Control Interval, Customer Information Control, System, Command List
Page 607 Page 609

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.
Top Page Image Contents